Location History:
- Koganei, JP (1982 - 1984)
- Tokyo, JP (1986)
Company Filing History:
Years Active: 1982-1986
Title: Kazuji Yamamoto: Innovator in Sewing Machine Technology
Introduction
Kazuji Yamamoto is a notable inventor based in Koganei, Japan. He has made significant contributions to the field of sewing machine technology, holding a total of 3 patents. His innovative designs have improved the functionality and efficiency of sewing machines, making them more user-friendly.
Latest Patents
One of his latest patents is a needle position indicating device for a sewing machine. This device electrically indicates whether a needle is positioned in a range suitable for thread passing when the sewing machine is stopped. It prevents intermittent indication during stitching operations, enhancing the user experience. The sewing machine is equipped with a device that includes a neon lamp and a light interrupting member. The lighting indicators on the exposed front surface of the sewing machine illuminate when the light from the neon lamp is transmitted by the interrupting member, indicating that the thread may be passed in a thread passing device.
Another significant patent is a sewing machine drive motor control system. This system features a speed-control circuit for the sewing machine motor, which includes a controller and thyristors that manage the motor's rotation based on the controller's operation. The circuit also incorporates operational amplifiers to produce a speed designating voltage and a frequency-voltage converter that detects the speed of rotation of the main shaft. A comparator is used to compare the speed designating voltage with the voltage from the frequency-voltage converter, ensuring precise motor drive phase detection.
Career Highlights
Kazuji Yamamoto is currently associated with Janome Sewing Machine Company Limited, where he continues to innovate and develop advanced sewing machine technologies. His work has significantly impacted the sewing industry, providing solutions that enhance the performance of sewing machines.
Collaborations
Throughout his career, Kazuji has collaborated with notable coworkers such as Hachiro Makabe and Kazuo Watanabe. Their combined expertise has contributed to the development of cutting-edge sewing machine technologies.
Conclusion
Kazuji Yamamoto's contributions to sewing machine technology through his patents and innovations have made a lasting impact on the industry. His work continues to inspire advancements in sewing machine design and functionality.